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Is $[p \land (p \to q)] \to q$ a tautology?

Jan 13, 2016

Find a False Counterexample for : "$\forall$ $A, B$ and $C$, we have $A \cap (B - C) = (A \cap B) - (A \cap C)$"

Jan 28, 2016

Simplify $(k +1)! > (k + 1)^2$ to prove true for $k ≥ 4$

Feb 5, 2016

What is $25^k$ + $5^k$

Feb 5, 2016

Simple expression for $\sum_{k=1}^{n-1}\:\frac{1}{k\left(k+1\right)}$

Feb 8, 2016

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Is this a valid proof of "a, b are rational, b ≠ 0, r is irrational, then a + br is irrational"

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Is this a valid proof of "For all integers m and n, if mn is even, then m is even, or n is even"?

+40

Is $[p \land (p \to q)] \to q$ a tautology?

+10

Find a False Counterexample for : "$\forall$ $A, B$ and $C$, we have $A \cap (B - C) = (A \cap B) - (A \cap C)$"

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